Add a configuration dialog, better output and PDF exporting

- Add configure dialog
- Dynamically create rendering options
- Load and save settings
- Pass on options to the renderer
- Add editor settings to the configure dialog
- Add exporting to PDF and printing
- Add options for PDF export to the configure dialog

resources/configuredialog.ui

@@ -0,0 +1,72 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>ConfigureDialog</class>
+ <widget class="QDialog" name="ConfigureDialog">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>400</width>
+    <height>300</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Dialog</string>
+  </property>
+  <layout class="QVBoxLayout" name="configureLayout">
+   <item>
+    <widget class="QGroupBox" name="renderOptionsGroupBox">
+     <property name="title">
+      <string>Render Options</string>
+     </property>
+     <layout class="QFormLayout" name="renderOptionsLayout"/>
+    </widget>
+   </item>
+   <item>
+    <widget class="QDialogButtonBox" name="buttonBox">
+     <property name="orientation">
+      <enum>Qt::Horizontal</enum>
+     </property>
+     <property name="standardButtons">
+      <set>QDialogButtonBox::Cancel|QDialogButtonBox::Ok</set>
+     </property>
+    </widget>
+   </item>
+  </layout>
+ </widget>
+ <resources/>
+ <connections>
+  <connection>
+   <sender>buttonBox</sender>
+   <signal>accepted()</signal>
+   <receiver>ConfigureDialog</receiver>
+   <slot>accept()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>248</x>
+     <y>254</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>157</x>
+     <y>274</y>
+    </hint>
+   </hints>
+  </connection>
+  <connection>
+   <sender>buttonBox</sender>
+   <signal>rejected()</signal>
+   <receiver>ConfigureDialog</receiver>
+   <slot>reject()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>316</x>
+     <y>260</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>286</x>
+     <y>274</y>
+    </hint>
+   </hints>
+  </connection>
+ </connections>
+</ui>

src/ukatali/configuredialog.py

@@ -0,0 +1,338 @@
+# -*- coding: utf-8 -*-
+from functools import partial
+
+from PyQt5 import QtCore, QtGui, QtWidgets
+from chordpro.renderers.html import get_options, get_option_groups
+
+from ukatali.util import coerce_bool, convert_units
+
+SUPPORTED_SIZES = {
+    QtGui.QPageSize.A4: 'A4',
+    QtGui.QPageSize.A5: 'A5',
+    QtGui.QPageSize.B5: 'B5',
+    QtGui.QPageSize.B6: 'B6',
+    QtGui.QPageSize.Letter: 'Letter',
+    QtGui.QPageSize.Legal: 'Legal',
+    QtGui.QPageSize.ExecutiveStandard: 'Executive'
+}
+SUPPORTED_UNITS = {
+    QtGui.QPageSize.Millimeter: 'mm',
+    QtGui.QPageSize.Point: 'pt',
+    QtGui.QPageSize.Inch: 'in'
+}
+SUPPORTED_ORIENTATIONS = {
+    'Portrait': QtGui.QPageLayout.Portrait,
+    'Landscape': QtGui.QPageLayout.Landscape
+}
+
+
+class ConfigureDialog(QtWidgets.QDialog):
+    def __init__(self, parent=None):
+        super().__init__(parent)
+        self.settings = QtCore.QSettings()
+        self.option_widgets = {}
+        self.option_values = {}
+        self.editor_values = {}
+        self.export_values = {}
+        self.setup_ui()
+        self.setup_options()
+
+    def setup_ui(self):
+        self.setObjectName('ConfigureDialog')
+        self.resize(600, 400)
+        self.configure_layout = QtWidgets.QVBoxLayout(self)
+        self.configure_layout.setObjectName("configure_layout")
+        self.category_layout = QtWidgets.QHBoxLayout()
+        self.category_layout.setObjectName('category_layout')
+        self.configure_layout.addLayout(self.category_layout)
+        self.category_list_widget = QtWidgets.QListWidget(self)
+        self.category_list_widget.setFixedWidth(100)
+        self.category_list_widget.addItems(['', '', '', ''])
+        self.category_list_widget.setObjectName('category_list_widget')
+        self.category_layout.addWidget(self.category_list_widget)
+        self.category_stack = QtWidgets.QStackedWidget(self)
+        self.category_stack.setObjectName('category_stack')
+        self.category_layout.addWidget(self.category_stack)
+        # General settings
+        self.general_page = QtWidgets.QWidget()
+        self.general_page.setObjectName('general_page')
+        self.category_stack.addWidget(self.general_page)
+        # Editor settings
+        self.editor_page = QtWidgets.QWidget()
+        self.editor_page.setObjectName('editor_page')
+        self.category_stack.addWidget(self.editor_page)
+        self.editor_layout = QtWidgets.QFormLayout(self.editor_page)
+        self.editor_layout.setObjectName('editor_layout')
+        self.editor_font_combobox = QtWidgets.QFontComboBox(self.editor_page)
+        self.editor_font_combobox.setFontFilters(QtWidgets.QFontComboBox.MonospacedFonts)
+        self.editor_font_combobox.setCurrentFont(QtGui.QFont('monospace'))
+        self.editor_font_combobox.setObjectName('editor_font_combobox')
+        self.editor_layout.addRow('Font', self.editor_font_combobox)
+        self.editor_size_spinbox = QtWidgets.QSpinBox(self.editor_page)
+        self.editor_size_spinbox.setValue(10)
+        self.editor_size_spinbox.setObjectName('editor_size_spinbox')
+        self.editor_layout.addRow('Size', self.editor_size_spinbox)
+        # Renderer settings
+        self.renderer_page = QtWidgets.QWidget()
+        self.renderer_page.setObjectName('renderer_page')
+        self.category_stack.addWidget(self.renderer_page)
+        self.render_layout = QtWidgets.QVBoxLayout(self.renderer_page)
+        self.render_options_combobox = QtWidgets.QComboBox(self.renderer_page)
+        self.render_options_combobox.setObjectName("render_options_combobox")
+        self.render_layout.addWidget(self.render_options_combobox)
+        self.render_options_stack = QtWidgets.QStackedWidget(self)
+        self.render_options_stack.setObjectName("render_options_stack")
+        self.render_layout.addWidget(self.render_options_stack)
+        # Export settings
+        self.export_page = QtWidgets.QWidget()
+        self.export_page.setObjectName('export_page')
+        self.category_stack.addWidget(self.export_page)
+        self.export_layout = QtWidgets.QFormLayout(self.export_page)
+        self.export_layout.setObjectName('export_layout')
+        self.export_size_combobox = QtWidgets.QComboBox(self.export_page)
+        for idx, (size_id, size_name) in enumerate(SUPPORTED_SIZES.items()):
+            self.export_size_combobox.addItem(size_name)
+            self.export_size_combobox.setItemData(idx, size_id)
+        self.export_size_combobox.setCurrentIndex(0)
+        self.export_size_combobox.setObjectName('export_size_combobox')
+        self.export_layout.addRow('Page size', self.export_size_combobox)
+        self.export_orientation_layout = QtWidgets.QHBoxLayout()
+        self.export_orientation_layout.setObjectName('export_orientation_layout')
+        self.export_orientation_portrait_radio = QtWidgets.QRadioButton(self.export_page)
+        self.export_orientation_portrait_radio.setChecked(True)
+        self.export_orientation_portrait_radio.setObjectName('export_orientation_portrait_radio')
+        self.export_orientation_layout.addWidget(self.export_orientation_portrait_radio)
+        self.export_orientation_landscape_radio = QtWidgets.QRadioButton(self.export_page)
+        self.export_orientation_landscape_radio.setObjectName('export_orientation_landscape_radio')
+        self.export_orientation_layout.addWidget(self.export_orientation_landscape_radio)
+        self.export_layout.addRow('Orientation', self.export_orientation_layout)
+        self.export_unit_combobox = QtWidgets.QComboBox(self.export_page)
+        for idx, (unit_id, unit_name) in enumerate(SUPPORTED_UNITS.items()):
+            self.export_unit_combobox.addItem(unit_name)
+            self.export_unit_combobox.setItemData(idx, unit_id)
+        self.export_unit_combobox.setCurrentIndex(0)
+        self.export_unit_combobox.setObjectName('export_unit_combobox')
+        self.export_layout.addRow('Unit', self.export_unit_combobox)
+        self.export_margin_top_spinbox = QtWidgets.QDoubleSpinBox(self.export_page)
+        self.export_margin_top_spinbox.setValue(20)
+        self.export_margin_top_spinbox.setSuffix(self.export_unit_combobox.currentText())
+        self.export_margin_top_spinbox.setObjectName('export_margin_top_spinbox')
+        self.export_layout.addRow('Top margin', self.export_margin_top_spinbox)
+        self.export_margin_left_spinbox = QtWidgets.QDoubleSpinBox(self.export_page)
+        self.export_margin_left_spinbox.setValue(20)
+        self.export_margin_left_spinbox.setSuffix(self.export_unit_combobox.currentText())
+        self.export_margin_left_spinbox.setObjectName('export_margin_left_spinbox')
+        self.export_layout.addRow('Left margin', self.export_margin_left_spinbox)
+        self.export_margin_right_spinbox = QtWidgets.QDoubleSpinBox(self.export_page)
+        self.export_margin_right_spinbox.setValue(20)
+        self.export_margin_right_spinbox.setSuffix(self.export_unit_combobox.currentText())
+        self.export_margin_right_spinbox.setObjectName('export_margin_right_spinbox')
+        self.export_layout.addRow('Right margin', self.export_margin_right_spinbox)
+        self.export_margin_bottom_spinbox = QtWidgets.QDoubleSpinBox(self.export_page)
+        self.export_margin_bottom_spinbox.setValue(20)
+        self.export_margin_bottom_spinbox.setSuffix(self.export_unit_combobox.currentText())
+        self.export_margin_bottom_spinbox.setObjectName('export_margin_bottom_spinbox')
+        self.export_layout.addRow('Bottom margin', self.export_margin_bottom_spinbox)
+        # Buttons
+        self.button_box = QtWidgets.QDialogButtonBox(self)
+        self.button_box.setOrientation(QtCore.Qt.Horizontal)
+        self.button_box.setStandardButtons(QtWidgets.QDialogButtonBox.Cancel |
+                                           QtWidgets.QDialogButtonBox.Ok)
+        self.button_box.setObjectName("button_box")
+        self.configure_layout.addWidget(self.button_box)
+
+        self.retranslate_ui()
+        self.button_box.accepted.connect(self.accept)
+        self.button_box.rejected.connect(self.reject)
+        self.category_list_widget.currentRowChanged.connect(self.category_stack.setCurrentIndex)
+        self.render_options_combobox.activated.connect(self.render_options_stack.setCurrentIndex)
+        on_editor_font_changed = partial(self._set_editor_value, 'font')
+        self.editor_font_combobox.currentFontChanged.connect(on_editor_font_changed)
+        on_editor_size_changed = partial(self._set_editor_value, 'size')
+        self.editor_size_spinbox.valueChanged.connect(on_editor_size_changed)
+        on_export_size_changed = partial(self._set_export_value, 'page_size')
+        self.export_size_combobox.currentIndexChanged.connect(on_export_size_changed)
+        self.export_unit_combobox.currentIndexChanged.connect(self.on_export_unit_changed)
+        on_export_margin_left_changed = partial(self._set_export_value, 'margin_left')
+        self.export_margin_left_spinbox.valueChanged.connect(on_export_margin_left_changed)
+        on_export_margin_right_changed = partial(self._set_export_value, 'margin_right')
+        self.export_margin_right_spinbox.valueChanged.connect(on_export_margin_right_changed)
+        on_export_margin_top_changed = partial(self._set_export_value, 'margin_top')
+        self.export_margin_top_spinbox.valueChanged.connect(on_export_margin_top_changed)
+        on_export_margin_bottom_changed = partial(self._set_export_value, 'margin_bottom')
+        self.export_margin_bottom_spinbox.valueChanged.connect(on_export_margin_bottom_changed)
+        on_export_orientation_portait_clicked = partial(self._set_export_value, 'orientation')
+        self.export_orientation_portrait_radio.toggled.connect(on_export_orientation_portait_clicked)
+
+    def retranslate_ui(self):
+        _translate = QtCore.QCoreApplication.translate
+        self.setWindowTitle(_translate("ConfigureDialog", "Configure"))
+        self.category_list_widget.item(0).setText(_translate('ConfigureDialog', 'General'))
+        self.category_list_widget.item(1).setText(_translate('ConfigureDialog', 'Editor'))
+        self.category_list_widget.item(2).setText(_translate('ConfigureDialog', 'Render'))
+        self.category_list_widget.item(3).setText(_translate('ConfigureDialog', 'PDF'))
+        self.export_orientation_portrait_radio.setText(_translate('ConfigureDialog', 'Portrait'))
+        self.export_orientation_landscape_radio.setText(_translate('ConfigureDialog', 'Landscape'))
+
+    def _set_option_value(self, name, value):
+        """Set an option value"""
+        self.option_values[name] = value
+
+    def _set_editor_value(self, name, value):
+        """Set an editor value"""
+        self.editor_values[name] = value
+
+    def _set_export_value(self, name, value):
+        """Set an export value"""
+        if name == 'page_size':
+            value = self.export_size_combobox.itemData(value)
+        elif name == 'units':
+            value = self.export_unit_combobox.itemData(value)
+        elif name == 'orientation':
+            value = QtGui.QPageLayout.Portrait if value else QtGui.QPageLayout.Landscape
+        self.export_values[name] = value
+
+    def setup_options(self):
+        for group in get_option_groups():
+            pretty_group = group.replace('_', ' ').title()
+            self.render_options_combobox.addItem(pretty_group)
+            page_widget = QtWidgets.QWidget()
+            page_layout = QtWidgets.QFormLayout(page_widget)
+            for name, details in get_options(group).items():
+                pretty_name = name.replace(group, '').replace('_', ' ').title()
+                self.option_values[name] = details['default']
+                widget = None
+                set_value = partial(self._set_option_value, name)
+                if details["type"] is int:
+                    widget = QtWidgets.QSpinBox(page_widget)
+                    if details['default']:
+                        widget.setValue(details['default'])
+                    widget.valueChanged.connect(set_value)
+                elif details["type"] is bool:
+                    widget = QtWidgets.QCheckBox(page_widget)
+                    widget.setChecked(coerce_bool(details['default']))
+                    widget.toggled.connect(set_value)
+                elif 'font' in name:
+                    widget = QtWidgets.QFontComboBox(page_widget)
+                    if details['default']:
+                        widget.setFont(QtGui.QFont(details['default']))
+                    widget.currentFontChanged.connect(set_value)
+                else:
+                    widget = QtWidgets.QLineEdit(page_widget)
+                    if details['default']:
+                        widget.setText(details['default'])
+                    widget.textChanged.connect(set_value)
+                if widget:
+                    widget.setObjectName(name)
+                    self.option_widgets[name] = widget
+                    page_layout.addRow(pretty_name, widget)
+                    if details['description']:
+                        label = QtWidgets.QLabel(page_widget)
+                        label.setText(details['description'])
+                        page_layout.addRow('', label)
+            self.render_options_stack.addWidget(page_widget)
+
+    def load_settings(self):
+        """Load the settings"""
+        # Editor settings
+        self.settings.beginGroup('editor')
+        if self.settings.contains('font'):
+            value = QtGui.QFont(self.settings.value('font'))
+            self.editor_values['font'] = value
+            self.editor_font_combobox.setCurrentFont(value)
+        if self.settings.contains('size'):
+            value = int(self.settings.value('size'))
+            self.editor_values['size'] = value
+            self.editor_size.setValue(value)
+        self.settings.endGroup()
+        # Renderer settings
+        self.settings.beginGroup('render')
+        for name, details in get_options().items():
+            if self.settings.contains(name):
+                value = self.settings.value(name)
+                if value is None:
+                    continue
+                if details['type'] is int:
+                    value = int(value)
+                    self.option_widgets[name].setValue(value)
+                elif details['type'] is bool:
+                    value = coerce_bool(value)
+                    self.option_widgets[name].setChecked(value)
+                elif 'font' in name:
+                    value = QtGui.QFont(value)
+                    self.option_widgets[name].setCurrentFont(value)
+                else:
+                    self.option_widgets[name].setText(value)
+                self.option_values[name] = value
+        self.settings.endGroup()
+        # PDF settings
+        self.settings.beginGroup('export')
+        if self.settings.contains('page_size'):
+            value = int(self.settings.value('page_size'))
+            self.export_values['page_size'] = value
+            self.export_size_combobox.setCurrentText(SUPPORTED_SIZES[value])
+        if self.settings.contains('unit'):
+            value = int(self.settings.value('unit'))
+            self.export_values['unit'] = value
+            self.export_unit_combobox.setCurrentText(SUPPORTED_UNITS[value])
+        if self.settings.contains('orientation'):
+            value = int(self.settings.value('orientation'))
+            self.export_values['orientation'] = value
+            self.export_orientation_portrait_radio.setChecked(value == QtGui.QPageLayout.Portrait)
+        margins = [
+            ('margin_left', self.export_margin_left_spinbox),
+            ('margin_right', self.export_margin_right_spinbox),
+            ('margin_top', self.export_margin_top_spinbox),
+            ('margin_bottom', self.export_margin_bottom_spinbox),
+        ]
+        for name, spinbox in margins:
+            if self.settings.contains(name):
+                value = float(self.settings.value(name))
+                self.export_values[name] = value
+                spinbox.setValue(value)
+        self.settings.endGroup()
+
+    def save_settings(self):
+        """Save the settings"""
+        # Editor settings
+        self.settings.beginGroup('editor')
+        for name, value in self.editor_values.items():
+            if isinstance(value, QtGui.QFont):
+                value = value.family()
+            self.settings.setValue(name, value)
+        self.settings.endGroup()
+        # Renderer settings
+        self.settings.beginGroup('render')
+        for name, value in self.option_values.items():
+            if isinstance(value, QtGui.QFont):
+                value = value.family()
+            self.settings.setValue(name, value)
+        self.settings.endGroup()
+        # Export settings
+        self.settings.beginGroup('export')
+        for name, value in self.export_values.items():
+            self.settings.setValue(name, value)
+        self.settings.endGroup()
+
+    def exec(self):
+        """Execute the dialog"""
+        self.load_settings()
+        return super().exec()
+
+    def accept(self):
+        """The user clicked the "OK" button"""
+        self.save_settings()
+        return super().accept()
+
+    def on_export_unit_changed(self, value):
+        self._set_export_value('unit', self.export_unit_combobox.itemData(value))
+        new_suffix = self.export_unit_combobox.itemText(value)
+        for spinbox in [self.export_margin_bottom_spinbox, self.export_margin_left_spinbox,
+                        self.export_margin_right_spinbox, self.export_margin_top_spinbox]:
+            old_suffix = spinbox.suffix()
+            spinbox.setSuffix(new_suffix)
+            spinbox.setValue(convert_units(spinbox.value(), old_suffix, new_suffix))
+            if new_suffix == 'in':
+                spinbox.setSingleStep(0.1)
+            else:
+                spinbox.setSingleStep(1.0)

src/ukatali/lexer.py

@@ -127,7 +127,7 @@ class ChordProLexer(Qsci.QsciLexerCustom):
     def styleText(self, start, end):
         """Style the text"""
 
-        keywords = ['chorus'] + \
+        keywords = ['verse', 'chorus', 'bridge'] + \
             [d for t in KNOWN_DIRECTIVES for d in t] + \
             ['start_of_' + vt for vt in KNOWN_VERSE_TYPES] + \
             ['end_of_' + vt for vt in KNOWN_VERSE_TYPES]

src/ukatali/mainwindow.py

@@ -1,17 +1,25 @@
 # -*- coding: utf-8 -*-
+import os
 from pathlib import Path
-from PyQt5 import QtCore, QtGui, QtWidgets, QtWebEngineWidgets, Qsci
 
+from PyQt5 import QtCore, QtGui, QtWidgets, QtWebEngineWidgets, Qsci, QtPrintSupport
 from chordpro import Song
-from chordpro.renderers.html import render
+from chordpro.renderers.html import render, get_options
+
+from ukatali.configuredialog import ConfigureDialog
 from ukatali.lexer import ChordProLexer
+from ukatali.util import coerce_bool
+
+CHORDPRO_FILTERS = 'ChordPro files (*.txt *.cho *.chordpro *.chopro);;All files (*)'
 
 
 class MainWindow(QtWidgets.QMainWindow):
     def __init__(self, parent=None):
         super().__init__(parent)
         self.setup_ui()
+        self.settings = QtCore.QSettings()
         self.filename = None
+        self.configure_dialog = ConfigureDialog(self)
 
     def setup_ui(self):
         self.setObjectName('MainWindow')
@@ -168,11 +176,14 @@ class MainWindow(QtWidgets.QMainWindow):
         self.cut_action.triggered.connect(self.file_editor.cut)
         self.copy_action.triggered.connect(self.file_editor.copy)
         self.paste_action.triggered.connect(self.file_editor.paste)
-        # QtCore.QMetaObject.connectSlotsByName(self)
         self.open_action.triggered.connect(self.on_open_clicked)
         self.save_action.triggered.connect(self.on_save_clicked)
         self.save_as_action.triggered.connect(self.on_save_as_clicked)
+        self.export_action.triggered.connect(self.on_export_clicked)
+        self.print_action.triggered.connect(self.on_print_clicked)
+        self.configure_action.triggered.connect(self.on_configure_clicked)
         self.file_editor.textChanged.connect(self.on_text_changed)
+        self.preview_view.page().pdfPrintingFinished.connect(self.on_pdf_finished)
 
     def retranslate_ui(self):
         _translate = QtCore.QCoreApplication.translate
@@ -226,12 +237,11 @@ class MainWindow(QtWidgets.QMainWindow):
 
     def on_open_clicked(self):
         """Open the file"""
-        if QtCore.QSettings().value('files/last-directory'):
+        if self.settings.value('files/last-directory'):
-            last_directory = QtCore.QSettings().value('files/last-directory')
+            last_directory = self.settings.value('files/last-directory')
         else:
             last_directory = ''
-        filename = QtWidgets.QFileDialog.getOpenFileName(self, 'Open file', last_directory,
+        filename = QtWidgets.QFileDialog.getOpenFileName(self, 'Open file', last_directory, filter=CHORDPRO_FILTERS)
-                                                         filter='All files *')
         if isinstance(filename, tuple):
             filename = filename[0]
         if not filename:
@@ -240,7 +250,7 @@ class MainWindow(QtWidgets.QMainWindow):
         self.filename = filename
         file_path = Path(filename)
         if file_path.exists():
-            QtCore.QSettings().setValue('files/last-directory', str(file_path.parent))
+            self.settings.setValue('files/last-directory', str(file_path.parent))
             self.file_editor.setText(file_path.open().read())
 
     def on_save_clicked(self):
@@ -253,25 +263,108 @@ class MainWindow(QtWidgets.QMainWindow):
 
     def on_save_as_clicked(self):
         """Save the file"""
-        if QtCore.QSettings().value('files/last-directory'):
+        if self.settings.value('files/last-directory'):
-            last_directory = QtCore.QSettings().value('files/last-directory')
+            last_directory = self.settings.value('files/last-directory')
         else:
             last_directory = ''
-        filename = QtWidgets.QFileDialog.getSaveFileName(self, 'Save file', last_directory,
+        filename = QtWidgets.QFileDialog.getSaveFileName(self, 'Save file', last_directory, filter=CHORDPRO_FILTERS)
-                                                         filter='All files *')
         if isinstance(filename, tuple):
             filename = filename[0]
         if not filename:
             return
 
         self.filename = filename
-        QtCore.QSettings().setValue('files/last-directory', str(Path(filename).parent))
+        self.settings.setValue('files/last-directory', str(Path(filename).parent))
         self.on_save_clicked()
 
-    def on_text_changed(self):
+    def on_configure_clicked(self):
-        """Update the preview when the text changes"""
+        """Show the configuration dialog"""
+        if self.configure_dialog.exec() == QtWidgets.QDialog.Accepted and self.file_editor.text():
+            self.on_text_changed()
+
+    def _get_render_options(self):
+        """Get all the render options from the settings"""
+        options = {}
+        self.settings.beginGroup('render')
+        for name, details in get_options().items():
+            if self.settings.contains(name):
+                value = self.settings.value(name)
+                if value is None:
+                    continue
+                if details['type'] is int:
+                    value = int(value)
+                elif details['type'] is bool:
+                    value = coerce_bool(value)
+                options[name] = value
+        self.settings.endGroup()
+        return options
+
+    def _render_song(self, extra_styles=None):
+        """Render the current song and return the HTML"""
+        options = self._get_render_options()
         text = self.file_editor.text()
         song = Song()
         song.parse(text)
-        html = render(song)
+        if song.metadata.get('copyright'):
+            extra_styles = extra_styles or ''
+            extra_styles += os.linesep
+            extra_styles += '@page {{ @bottom-left {{ content: "{}"; }} }}'.format(song.metadata.get('copyright'))
+        return render(song, options, extra_styles)
+
+    def on_text_changed(self):
+        """Update the preview when the text changes"""
+        html = self._render_song()
         self.preview_view.setHtml(html)
+
+    def on_export_clicked(self):
+        """Export the current song to PDF"""
+        if self.filename:
+            last_directory = str(Path(self.filename).with_suffix('.pdf'))
+        elif self.settings.value('files/last-directory'):
+            last_directory = self.settings.value('files/last-directory')
+        else:
+            last_directory = ''
+        filename = QtWidgets.QFileDialog.getSaveFileName(self, 'Export to PDF', last_directory,
+                                                         filter='PDF files (.pdf)*')
+        if isinstance(filename, tuple):
+            filename = filename[0]
+        if not filename:
+            return
+        filename = Path(filename)
+        self.settings.setValue('files/last-directory', str(filename.parent))
+        # Load the page layout from settings
+        self.settings.beginGroup('export')
+        page_size = QtGui.QPageSize(int(self.settings.value('page_size', QtGui.QPageSize.A4)))
+        orientation = int(self.settings.value('orientation', QtGui.QPageLayout.Portrait))
+        unit = int(self.settings.value('unit', QtGui.QPageLayout.Millimeter))
+        margin_left = float(self.settings.value('margin_left', 20))
+        margin_right = float(self.settings.value('margin_right', 20))
+        margin_top = float(self.settings.value('margin_top', 20))
+        margin_bottom = float(self.settings.value('margin_bottom', 20))
+        self.settings.endGroup()
+        margins = QtCore.QMarginsF(QtCore.QMargins(margin_left, margin_top, margin_right, margin_bottom))
+        page_layout = QtGui.QPageLayout(page_size, orientation, margins, unit)
+        # Export to PDF
+        self.preview_view.page().printToPdf(str(filename), page_layout)
+
+    def on_pdf_finished(self, filename, is_success):
+        """A slot to notify the user when the PDF is done"""
+        if is_success:
+            QtWidgets.QMessageBox.information(self, 'Export to PDF Successful',
+                                              'Successfully exported to "{}"'.format(Path(filename).name))
+        else:
+            QtWidgets.QMessageBox.critical(self, 'Error Exporting to PDF', 'There was an error while exporting to PDF')
+
+    def on_print_clicked(self):
+        """Print the current song"""
+
+        def _on_print_finished(is_success):
+            print(is_success)
+
+        # print(QtPrintSupport.QPrinterInfo.defaultPrinterName())
+        # default_printer = QtPrintSupport.QPrinterInfo.defaultPrinter()
+        # print(default_printer)
+        printer = QtPrintSupport.QPrinter()
+        print_dialog = QtPrintSupport.QPrintDialog(printer, self.preview_view.page().view())
+        if print_dialog.exec() == QtWidgets.QDialog.Accepted:
+            self.preview_view.page().print(printer, _on_print_finished)

src/ukatali/util.py

@@ -0,0 +1,25 @@
+def coerce_bool(value):
+    """Coerce a value to be a boolean"""
+    if isinstance(value, str):
+        return value[0].lower() in ['t', 'y', '1']
+    else:
+        return bool(value)
+
+
+def convert_units(value, old_unit, new_unit):
+    """Convert a value from one unit to another"""
+    if old_unit == 'in' and new_unit == 'mm':
+        return value * 25.4
+    if old_unit == 'mm' and new_unit == 'in':
+        return value / 25.4
+    if old_unit == 'in' and new_unit == 'pt':
+        return value * 72.0
+    if old_unit == 'pt' and new_unit == 'in':
+        return value / 72.0
+    if old_unit == 'mm' and new_unit == 'pt':
+        # Convert to in and then to pt
+        return (value / 25.4) * 72.0
+    if old_unit == 'pt' and new_unit == 'mm':
+        # Convert to in and then to mm
+        return (value / 72.0) * 25.4
+    return value